Fuse Box Issues???
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Joined: Jun 2019
Posts: 73
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From: Olympia, WA
Fuse Box Issues???
Hey all,
I have a 96 LT1 AT that I’m hoping to get some help/advice with my fuse box.
It all started when the Check Engine Light came on and discovered a DTC code of P0719 – Brake Switch B Circuit Low. So I picked up a test light thinking the fuses would be the first place to start trouble shooting.
This is where I need help:
Testing with the ignition in the run position so assuming all fuses should light:
Fuses 1, 2, 5, 9, 10, 12, 13, 14 would not light at all - all others lit just fine. I replaced a few if the fuses and tested the others with a multi-meter and they seem to be working fine but still no lighting. Fuses are not blown either. Also, all the fuses above are 5 amp (is that a clue?). Anyway, I guess my question is this normal for these fuses not to light, or do I have bigger problems or a short in the electrical system. The battery seems fine and not draining – around 12.86 volts on the multi-meter. Engine starts up fine first time every time and the car runs great same as before.
Any ideas?
Thanks.
I have a 96 LT1 AT that I’m hoping to get some help/advice with my fuse box.
It all started when the Check Engine Light came on and discovered a DTC code of P0719 – Brake Switch B Circuit Low. So I picked up a test light thinking the fuses would be the first place to start trouble shooting.
This is where I need help:
Testing with the ignition in the run position so assuming all fuses should light:
Fuses 1, 2, 5, 9, 10, 12, 13, 14 would not light at all - all others lit just fine. I replaced a few if the fuses and tested the others with a multi-meter and they seem to be working fine but still no lighting. Fuses are not blown either. Also, all the fuses above are 5 amp (is that a clue?). Anyway, I guess my question is this normal for these fuses not to light, or do I have bigger problems or a short in the electrical system. The battery seems fine and not draining – around 12.86 volts on the multi-meter. Engine starts up fine first time every time and the car runs great same as before.
Any ideas?
Thanks.
Last edited by jakey1999; Jan 31, 2020 at 01:49 AM.
Thread Starter
Advanced
Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
Hey all,
I have a 96 LT1 AT that I’m hoping to get some help/advice with my fuse box.
It all started when the Check Engine Light came on and discovered a DTC code of P0719 – Brake Switch B Circuit Low. So I picked up a test light thinking the fuses would be the first place to start trouble shooting.
This is where I need help:
Testing with the ignition in the run position so assuming all fuses should light:
Fuses 1, 2, 5, 9, 10, 12, 13, 14 would not light at all - all others lit just fine. I replaced a few if the fuses and tested the others with a multi-meter and they seem to be working fine but still no lighting. Fuses are not blown either. Also, all the fuses above are 5 amp (is that a clue?). Anyway, I guess my question is this normal for these fuses not to light, or do I have bigger problems or a short in the electrical system. The battery seems fine and not draining – around 12.86 volts on the multi-meter. Engine starts up fine first time every time and the car runs great same as before.
Any ideas?
Thanks.
I have a 96 LT1 AT that I’m hoping to get some help/advice with my fuse box.
It all started when the Check Engine Light came on and discovered a DTC code of P0719 – Brake Switch B Circuit Low. So I picked up a test light thinking the fuses would be the first place to start trouble shooting.
This is where I need help:
Testing with the ignition in the run position so assuming all fuses should light:
Fuses 1, 2, 5, 9, 10, 12, 13, 14 would not light at all - all others lit just fine. I replaced a few if the fuses and tested the others with a multi-meter and they seem to be working fine but still no lighting. Fuses are not blown either. Also, all the fuses above are 5 amp (is that a clue?). Anyway, I guess my question is this normal for these fuses not to light, or do I have bigger problems or a short in the electrical system. The battery seems fine and not draining – around 12.86 volts on the multi-meter. Engine starts up fine first time every time and the car runs great same as before.
Any ideas?
Thanks.
Today I bought a new battery and cleared the DTC P0719 code mentioned above. We'll see what happens.
In mean time, also performed a ground test at all the fuses according to the Haynes Manual. A good majority of them failed so now I'm wondering if I have a break in the ground system somewhere. Another thing that just came up today is the climate control fan is running on high at all times no matter what the setting is on - 1 thru 10.
Please help!
Thread Starter
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Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
Sorry, I meant when using a test light to check for voltage at the fuse. It could be some are switched fuses, not constant, but I was testing with the ignition in the run position.
Last edited by jakey1999; Jan 31, 2020 at 11:11 PM.
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Joined: Aug 2019
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From: Minford, Ohio
You are right, some circuits are hot all the time, like horn, headlights, power seats, ect. Some will work when the key is turned to accessory and then some when the key is turned to run. I would pull the ones that won't light and test the connector the fuse plugs into. One side should be hot and one side won't, just depends on which way the current is flowing in that circuit. If the light will light with the fuse out but not when you are testing the fuse, the fuse is bad. Sometimes if you clean the fuse blades they will work because they were just corroded from age.
Thread Starter
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Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
You are right, some circuits are hot all the time, like horn, headlights, power seats, ect. Some will work when the key is turned to accessory and then some when the key is turned to run. I would pull the ones that won't light and test the connector the fuse plugs into. One side should be hot and one side won't, just depends on which way the current is flowing in that circuit. If the light will light with the fuse out but not when you are testing the fuse, the fuse is bad. Sometimes if you clean the fuse blades they will work because they were just corroded from age.
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Thread Starter
Advanced
Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
Thread Starter
Advanced
Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
Thread Starter
Advanced
Joined: Jun 2019
Posts: 73
Likes: 3
From: Olympia, WA
Thanks
Last edited by jakey1999; Feb 2, 2020 at 12:42 AM.
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Joined: Aug 2019
Posts: 596
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From: Minford, Ohio
I'm using the negative battery terminal to test all circuits, Some light and some don't so I'm not sure what's going on. Anyway, things are working good now. The only issue I'm having is there is no air coming from the front windshield vent when the setting is on defrost. On auto it does come out of the windshield vent. I don't think this is electrical issue maybe something going on with the vacuum tubes? Seen other posts that suggest it is related to the ac programmer.
Thanks
Thanks
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Joined: Jun 2019
Posts: 73
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From: Olympia, WA
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Joined: Aug 2019
Posts: 596
Likes: 146
From: Minford, Ohio
I have the climate control also. Most of my buttons did not work so I found a video on youtube that shows you how to clean all the contacts on the head unit. Here's a link to it:
. After I did this every button worked like new! The previous owner didn't have a garage and the car leaked water badly so it had water sitting in it and that causes a lot of problems for electronics. I had to replace the control unit for the radio and one of the power seat motors didn't work. Keeping them dry on the inside is very important!